Improvement in nut-lock



"llttitetl gittata @wat @inline CASPER DITTMAN, OF LEACOOK, PENNSYLVANIA.

Letters Patent No. 103,308, dated Maf/y 24, 1870.

. v i IMPROVEMENT IN NUT-LOCK.

-Mgmm The Schedule referred to in these Letters Patent vand making part of lthe same MAW I, CASPER DITTMAN, of Leacock, in thc county of I Lancaster and State of. Pennsylvania, have invented 1, 2, and 4, No. 5, is a loose l'n'olongat-ion, which' may be attached bya rivet. p

Number 3 shows one corner turned down into the wood, the other up against the nut, on opposite sides.

'lhe fasteners, A B, consist of a double square, that is, the inner perforated square disk B, through which the bolt passes, is raised, as'shown. .disk has a 4iange, A, of three or four corners, projecting beyond the raised central disk, so that the corners come opposite` the center of the sides of the inner disk. Being made of malleable iron, or other yielding metal, the corners can be turned up or down against the nut, or driven into the wood, as shown, (3.) t

4 shows a fastener having the central disk B, with one side of the fiange A prolonged, seenin Figure 4,V or bent around the corner ot' the timber, as shown by 6, Figure 2.

This prolongation might unite a disk and flange at each end, soas to eontine two. bnrs wit-h a double This.

fastener, as shown by number T. The raised disk is calculated for` being let into the' wood, boxed out for its reception, and, when the nut is drawn down tight upon the fastener, the corners projecting are bent up against the sides of the bur; the square disk, being imbedded in the wood, prevents it from turning, and the corners turned up to embrace the bur confine it also, and thus secure it.

I am aware that square fasteners are not new. Patent No. 94,885, ot September 14, 1869, is made to turn up, but has not the central diagonal disk,shown,

as also in the right and left screw-fastener between two burs, as in patent of October 12, 1869, No. (Hemel. In the iirst, the nut and fastener are arranged; and operated substantially in a different manner, as"also in the other referred to, both of which arrangen'ients I disclaim. I am not aware. of a washer, having a central raised disk in a diagonal position to that ot' the projecting ange corners or prolongation'of one o'i' one of its sides. 'lille various methods ot" applying the same .are shown in f the drawing. In one case, three projecting corners, instead' of t'onr, are used.

What I claim as my invention, is lThe lock-washer, consisting oi' a square central disk, B, and thin diagonal corner ilanges A, one ot' which may he. prolonged, asherein shown and described.

CASPER DI'ITMAN. Witnesses :l

WM. B.W11inr, .Moon STAUFFER. 

